Everything we've done so far in Year 9.....

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Across
  1. 5. star that has used up all its hydrogen and whose outer surface swells
  2. 6. angle a light ray makes with the normal on reflection
  3. 10. exploding star
  4. 13. overall force acting on a body
  5. 14. unit of frequency
  6. 15. quantity in Physics that has both a size and direction
  7. 16. shape of a sound wave
  8. 18. forward force from an engine or device
  9. 19. region of a longitudinal wave where particles are close together
  10. 20. distance between 2 crests on a wave
  11. 21. name given to the behaviour of light when it passes from one medium to another
Down
  1. 1. contact force opposes motion
  2. 2. force that acts on mass
  3. 3. height of a transverse wave
  4. 4. Equals distance divided by time
  5. 7. fate of a large mass star
  6. 8. change in velocity/time
  7. 9. shape of a planet's orbit
  8. 11. process by which a star produces energy
  9. 12. force/acceleration
  10. 17. force acting upwards on a body in a liquid
  11. 22. ball of rock, dust and frozen gases